Bug 284804 – AX: VoiceOver no longer announces change to aria-expanded value

• Status: NEW
• Component: Accessibility

[Nick Bromley]

On Sequoia 15.1.1 and iOS 18.1.1, when the aria-expanded value on a button changes from 'false' to 'true' or vice versa following button activation, VoiceOver does not announce this change. The issue was not present on earlier OS versions.


Replication steps
-----------------
- Open https://a11ysupport.io/tests/html/aria/aria-expanded.html
- Navigate to the 'Show more' button
- Activate the button

Actual outcome
----------------
- VoiceOver does not announce "expanded" or "collapsed" as the disclosure content is revealed/hidden
- On iOS, note how VoiceOver starts to announce the new value (which is visible in the VoiceOver caption text at the bottom of the screen) but is cut off

Expected outcome
-------------------
- Following button activation, VoiceOver should announce the new value of aria-expanded

[Radar WebKit Bug Importer]

<rdar://problem/141604788>

[Joe Watkins]

Confirmed working as expected in this setting:
MacOS: 14.7.1
Safari: 18.1.1

Does not work as expected in:
MacOS: 15.3.2
Safari: 18.3.1

[Adrian Roselli]

Tested the example in VoiceOver / macOS 15.4 / Safari 18.4. I used the Space and Enter keys to toggle the disclosure trigger.

It worked as expected, announcing the new state after activating the disclosure trigger.

Given Joe Watkins' test, I don't think this is ready to close (but I think it is ready to assign) since the bug has already regressed once in the version 18 releases.